<template>
    <view class="u-keyboard" @touchmove.stop.prevent="() => {}">
        <view class="u-keyboard-grids">
            <view
                class="u-keyboard-grids-item"
                :class="[btnBgGray(index) ? 'u-bg-gray' : '', index <= 2 ? 'u-border-top' : '', index < 9 ? 'u-border-bottom' : '', (index + 1) % 3 != 0 ? 'u-border-right' : '']"
                :style="[itemStyle(index)]"
                v-for="(item, index) in numList"
                :key="index"
                :hover-class="hoverClass(index)"
                :hover-stay-time="100"
                @tap="keyboardClick(item)">
                <view class="u-keyboard-grids-btn">{{ item }}</view>
            </view>
            <view class="u-keyboard-grids-item u-bg-gray" hover-class="u-hover-class" :hover-stay-time="100" @touchstart.stop="backspaceClick"
                @touchend="clearTimer">
                <view class="u-keyboard-back u-keyboard-grids-btn">
                    <u-icon name="backspace" :size="38" :bold="true"></u-icon>
                </view>
            </view>
        </view>
    </view>
</template>

<script>
    export default {
        props: {
            // 键盘的类型，number-数字键盘，card-身份证键盘
            mode: {
                type: String,
                default: 'number'
            },
            // 是否显示键盘的"."符号
            dotEnabled: {
                type: Boolean,
                default: true
            },
            // 是否打乱键盘按键的顺序
            random: {
                type: Boolean,
                default: false
            }
        },
        data() {
            return {
                backspace: 'backspace', // 退格键内容
                dot: '.', // 点
                timer: null, // 长按多次删除的事件监听
                cardX: 'X' // 身份证的X符号
            };
        },
        computed: {
            // 键盘需要显示的内容
            numList() {
                let tmp = [];
                if (!this.dotEnabled && this.mode == 'number') {
                    if (!this.random) {
                        return [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
                    } else {
                        return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
                    }
                } else if (this.dotEnabled && this.mode == 'number') {
                    if (!this.random) {
                        return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0];
                    } else {
                        return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0]);
                    }
                } else if (this.mode == 'card') {
                    if (!this.random) {
                        return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0];
                    } else {
                        return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0]);
                    }
                }
            },
            // 按键的样式，在非乱序&&数字键盘&&不显示点按钮时，index为9时，按键占位两个空间
            itemStyle() {
                return index => {
                    let style = {};
                    if (this.mode == 'number' && !this.dotEnabled && index == 9) style.flex = '0 0 66.6666666666%';
                    return style;
                };
            },
            // 是否让按键显示灰色，只在非乱序&&数字键盘&&且允许点按键的时候
            btnBgGray() {
                return index => {
                    if (!this.random && index == 9 && (this.mode != 'number' || (this.mode == 'number' && this.dotEnabled))) return true;
                    else return false;
                };
            },
            hoverClass() {
                return index => {
                    if (!this.random && index == 9 && (this.mode == 'number' && this.dotEnabled || this.mode == 'card')) return 'u-hover-class';
                    else return 'u-keyboard-hover';
                }
            }
        },
        methods: {
            // 点击退格键
            backspaceClick() {
                this.$emit('backspace');
                clearInterval(this.timer); //再次清空定时器，防止重复注册定时器
                this.timer = null;
                this.timer = setInterval(() => {
                    this.$emit('backspace');
                }, 250);
            },
            clearTimer() {
                clearInterval(this.timer);
                this.timer = null;
            },
            // 获取键盘显示的内容
            keyboardClick(val) {
                // 允许键盘显示点模式和触发非点按键时，将内容转为数字类型
                if (this.dotEnabled && val != this.dot && val != this.cardX) val = Number(val);
                this.$emit('change', val);
            }
        }
    };
</script>

<style lang="scss" scoped>
    @import "../../libs/css/style.components.scss";

    .u-keyboard {
        position: relative;
        z-index: 1003;
    }

    .u-keyboard-grids {
        @include vue-flex;
        flex-wrap: wrap;
    }

    .u-keyboard-grids-item {
        flex: 0 0 33.3333333333%;
        text-align: center;
        font-size: 50rpx;
        color: #333;
        @include vue-flex;
        align-items: center;
        justify-content: center;
        height: 110rpx;
        font-weight: 500;
    }

    .u-bg-gray {
        background-color: $u-border-color;
    }

    .u-keyboard-back {
        font-size: 36rpx;
    }

    .u-keyboard-hover {
        background-color: #e7e6eb;
    }
</style>
